MC68HC05E5 Datasheet, PDF (21/140 Pages) Freescale Semiconductor, Inc – General Release Specification

1.5.4 RESET
1.5.5 PA0–PA7
1.5.6 PB0–PB7
1.5.7 PC0–PC3
Freescale Semiconductor, Inc.
General Description
Functional Pin Description
This active low pin is used to reset the MCU to a known startup state by
pulling RESET low. The RESET pin contains an internal Schmitt trigger
as part of its input to improve noise immunity. See Section 5. Resets for
additional information.
These eight I/O lines comprise port A. The state of any pin is software
programmable and all port A lines are configured as input during
power-on or reset. See 7.6 Input/Output Programming for additional
information.
These eight I/O lines comprise port B. The state of any pin is software
programmable and all port B lines are configured as input during
power-on or reset. PB7 (SCL) and PB6 (SDA) can be configured as an
M-bus interface. (Refer to Section 11. Motorola Bus (M Bus) Interface
for M-bus pin configurations). PB3–PB5 (TIPL, SCK, and SDIO) can be
configured as a synchronous serial interface (SSI). Refer to Section 12.
Synchronous Serial Interface (SSI) and to 7.6 Input/Output
Programming for additional information.
These four I/O lines comprise port C. The state of any pin is software
programmable and all port C lines are configured as input during
power-on or reset. 7.6 Input/Output Programming for additional
information.
MC68HC05E5 — Rev. 1.0
General Release Specification
General Description
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